Now you'll have to bare with me as this is all from memory. I had some spare magic SP and thought I might finally get around to buying the Balance skill. Its the one that looks like a set of old fashioned scales. For some misguided reason I had this idea it was something that you put into your healing bombs to allow them to heal yourself as well as your team mates in some sort of balance HP setup. Never thought i'd have a use for it but I had nothing else to buy except Sap Aura (and i'm not that desperate yet

So imagine my suprise when I buy levels 1 and 2 and look at level 2. It says something about balancing HP as I expected and a 30% loss. I check the level 1 version and it has a 50% loss.
*thinks to himself it looks a little steep no wonder I never bought it before*
Then I notice its a Power Stanza! Now i'm confused (Killiane was no where around AFAIK) and curious. Guess I won't be putting it into my healing bombs. So what does it do?!?
I'm in a team with one other player. I'm in Avendale the teammate is in Fairhaven. Being male I don't read any more instructions I just push it and see what happens. I lose about 1500HP (about 50%) ad the stanza goes grey (at least is on a different timer to Inv, speed up, melee aura, magic aura, beserk, etc).
I sit there for a few minutes reading the instructions, which don't seem to make much sense, then shrug and walk off (t'was past my bed-time).
So the point of this post is, what the hell does Balance do?